Answer:
70/100 X 2000 = 1400 tonnes of iron.
Explanation:
take the percentage of iron oxide and divide with overall amount of iron oxide using 2000 tonnes of hematite ore. 1400 tonnes of iron will be produced. this is not the percentage. if you want the percentage of iron produced just divide.
70/100 x 200 = 1400 tonnes of iron
percentage of iron produced = 70/1400 x 100 = 5 % of iron produced from 70% of iron oxide in 2000 tones of hematite ore